TIME CORRELATIONS OF INTENSITY IN THE CASE OF LIGHT TRANSMISSION THROUGH AN INHOMOGENEOUS MEDIUM

L. Mandeļ

B. N. Jagatap, S. V. Lawande

We study the cooperative effects in the fluorescent radiation emitted from a system of N three-level atoms driven by two intense coherent fields. It is shown that the analytical expressions for fluorescent spectra and intensity-intensity correlations can be obtained for arbitrary N in a special case. These expressions manifest the essential cooperative effects.

Samina Masood, Iram Saleem

Vladimir L. Kuzmin, V. P. Romanov

V. S. Zuev, Vladimir A. Shcheglov

Robert L. Kelly

IMeasurements of space-time correlations in the intensity of a beam of scattereq particles yield information about the scatterer.Goldberger and Watson have developed a theory of such measl~ementG appropriate to the case of ne~rly elastic scattering; in this paper we extend their theory to the case of inelastic scattering.The main result of our work is that under certain experimental conditions the correlated counting rate in an inelastic scattering experiment is of a form equivalent to the correlated counting rate for an incoherent beam of particles emitted by a source.This result applies, in particular, to Raman or Brillouin scattering of light by phonons in an extended target.However, estimates of the signal to noise ratio for this case indicate that it may not be possible to observe intensity correlations in Raman or Brillouin lines using presently available light sources. ABSTRACT OF PART IIThe coherent excitation of several atomic status by inelastic electron' scattering and their subsequent radia ti ve decay is considered.General expressions for the photon counting rate in a quantum beat experiment, and the total number of photons counted. in a le,vel crossing experiment are d.erived.The general results are used to calculate the phase of the oscillatory part of the photon counting rate in the Radeishi-Nierenberg quantum beat experiment.